WEEK 5 NOTES
detail timely Accurate
5-1 (150 words and 1 reference)
One of the best-known longitudinal designs is Lewis Terman’s study of giftedness. He began tracking gifted children into adolescence and adulthood in 1925; the study is supposed to conclude in 2020. Explain the unique benefits of such a study, and then explain the problems caused by this type of design.
5-2 (150 words and 1 reference)
Explain the circumstances when a quasi-experimental design would be preferable to a between-subjects design, but also discuss why an explanatory research method is superior to a predictive method.
6-1 (150 words and 1 reference)
Contrast the three types of factorial designs.
6-2 (150 words and 1 reference)
Lay out the design for two between-subjects experiments: (a) an experiment involving an experimental group and a control group, and (b) a factorial design with three independent variables that have 3, 2, and 2 levels, respectively.
7-1 (150 words and 1 reference)
Suppose that, for a t-test, your computed value for t is +3.28. The critical value of t is +2.048. Explain what this means. Do you reject the null hypothesis or not? Now suppose that you have 28 degrees of freedom and are using a two-tailed (nondirectional) test. Draw a simple figure to illustrate the relationship between the critical and the computed values of t for this result.
7-2 (150 words and 1 reference)
Choose an article from the newspaper, an online source, or a magazine, then identify the descriptive statistics included in the article. Were the statisitcs appropriately described in the article? Explain. Discuss if the descriptive statistics used in your source supported the arguments made in it. Were the descriptive statistics misleading? Explain.
8-2 (150 words and 1 reference)
A researcher computed the
F ratio for a four-group experiment. The computed
F is 4.86. The degrees of freedom are 3 for the numerator and 16 for the denominator.
1. Is the computed value of
F significant at
p < .05? Explain.
2. Is it significant at
p < .01? Explain.
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